When I was a business world creature, I learned about the mutual back-rubbing during the famous 3-martini lunch routine.
(Back-rubbing is such an equal-opportunity human behaviour that it takes place everywhere and anywhere and any time :=)
After jet-packing out of that, um, lunch sub-culture, I've tried to learn about healthy lunches. So, I'll show you my lunch and maybe you could show me your lunch :=) More below.